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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe09ae449a1d450c941405d11f927f5bfabcdea6c15a3abf039abc35d87111d0' 
  AND token = 'Ym+UW5sFd0pfhTg9y8L3oSiiBrkFhQpoQcvPy5Bvve4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}